Endeavour can burn him beyond regen, but it ultimately depends who attacks first. Because one solid punch from hulk will probably kill endeavor, but one ordinary prominence burn to the face will probably kill hulk.
Hulk's normal punches seem too powerful for Endeavor. Endeavor's best is only coming out if he's away from civilians, and he can't afford to do it at too close a range. I'm not sure how Hulk will handle the flames at its hottest. Endeavor may overheat before burning Hulk as badly as the Infinity Stones did. Hulk has trouble against lightning, but his durability against other energy attacks is pretty good. Endeavor has flight and range going for him, but his overheating issue may allow Hulk to win as he slows down.
Hulk takes it at close range. Endeavor taking it from a distance is dependent on how well his flames work and how much he has to exert himself to do meaningful damage. He probably loses if he holds back due to civilians while Hulk won't.